Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//=============================================================================//
#ifndef FOCUSNAVGROUP_H
#define FOCUSNAVGROUP_H
#ifdef _WIN32
#pragma once
#endif
#include <vgui/VGUI.h>
#include <vgui_controls/PHandle.h>
namespace vgui
{
class Panel;
//-----------------------------------------------------------------------------
// Purpose: Handles navigation through a set of panels, with tab order & hotkeys
//-----------------------------------------------------------------------------
class FocusNavGroup
{
public:
FocusNavGroup(Panel *panel);
~FocusNavGroup();
virtual Panel *GetDefaultPanel(); // returns a pointer to the panel with the default focus
virtual void SetDefaultButton(Panel *panel); // sets which panel should receive input when ENTER is hit
virtual VPANEL GetDefaultButton(); // panel which receives default input when ENTER is hit, if current focused item cannot accept ENTER
virtual VPANEL GetCurrentDefaultButton(); // panel which receives input when ENTER is hit
virtual Panel *FindPanelByHotkey(wchar_t key); // finds the panel which is activated by the specified key
virtual bool RequestFocusPrev(VPANEL panel = NULL); // if panel is NULL, then the tab increment is based last known panel that had key focus
virtual bool RequestFocusNext(VPANEL panel = NULL);
virtual Panel *GetCurrentFocus();
virtual VPANEL SetCurrentFocus(VPANEL panel, VPANEL defaultPanel); // returns the Default panel
// sets the panel that owns this FocusNavGroup to be the root in the focus traversal heirarchy
// focus change via KEY_TAB will only travel to children of this main panel
virtual void SetFocusTopLevel(bool state);
virtual void SetCurrentDefaultButton(VPANEL panel, bool sendCurrentDefaultButtonMessage = true);
private:
bool CanButtonBeDefault(VPANEL panel);
VPanelHandle _defaultButton;
VPanelHandle _currentDefaultButton;
VPanelHandle _currentFocus;
Panel *_mainPanel;
bool _topLevelFocus;
};
} // namespace vgui
#endif // FOCUSNAVGROUP_H